Preparing open and closed hollow bodies by centrifugal casting



Aug. 8, 1933. wl RAYM ET AL 1,921,699

PREPARING OPEN AND CLOSED HOLLOW BODIES BY CENTRIFUGAL CASTING' Filed Jan. 5, 1951 s sheets-sheet 1 8, 1933. w RAYM ET AL 1,921,699

REPARING OPEN AND CLOSED HOLLOW BODIES BY GENTRIFUGAL CASTING Filed Jan- 5 1951 ,asheetsfsheet 2 4 a 4 8 .9 @m- @M- ffh/Mf' wk fs 2 *l V a af f z l a? W f 1 .nl :m w 8 lne nngz/0.

Allg. 8, W' RAYM ET AL PREPARING OPEN AND CLOSED HOLLOW BODIES BY CENTRIFUGAL CASTING Fii-ed Jan. 5, 1951 3 s heets sheet 3 lid/'52 :if: 'hf 'Tg j 5v 51:: 33

37 .v-.JJ-t-: :3&2 37 /8 52 3# /40 9 1,6/ I 44 L 47 45 #3 5] 'lgZ/Z. 35- 3]/ 35 43 L 4514i I i.- i@ 37 37 46 I 44 47 L y l zlnuw iii/.4 M2274/ of casting cylindrical Patented Aug. 8,/1933 A 1,921,699 rREPARmG. OPEN AND CLOSED HOLLOW' BODIES BY Willibald Raym,

CENTRIFUGAL CASTING Deuz, Karl Mertens, Klafeld, an

Albert Slzer, Geisweid, Germany, assignors to llundt & Weber Gesellschaft mit beschrankter Haftung, Geiswed, Germany,

a Corporation Application January 5, 1931, Serial No. 506,766,l

and'in Germany August 1, 1929 2 Claims'.

It has already been proposed to prepare cylindrical rings by centrifugal casting, by providing a guide wall in the rotary. mould for the liquid material which rises from the bottom'of the mould. This arrangement however permits only rings open at both ends, which rings. are then further worked by rolling and like operations. With such an arrangement it is not possible to prepare, by centrifugal casting, hollow bodies which are closed at one or both ends nor hollow bodies which have a plurality of walls. i

.The apparatus according to the present invention permits of the preparation of such hollow bodies in that a in the centrifugal casting mould which so guide the metal that the said hollow `bodies are obtained. At the same time provision is made for retaining the cores. in position.

The arrangement maybe such that the cores, or the mould closure plate carrying the cores, are movable relatively to the mould both to permit of the closure of one side of the hollow body by the Vmetal and also to prevent apremature solidification ofthe material with consequent incomplete filling of the mould in the casting more particularly of thin walled hollow bodies.

Also the casting gutter may be made movable and may be introduced into the rotary mould prior to, simultaneously with, or subsequent to the core, in order to ensure a uniform .distribution of the material and a complete filling of the mould. In certain circumstances -two movable casting gutters may be used which execute different motions or are moved differently with respect to each other, or a single gutter with two outlets may be utilized vand in this case the outletsmay be provided with obturating devices to permit of rendering them temporarily inoperative.

With such an arrangement it is possible to cast by the centrifugal method the comparatively thin walled tuyres `of copper or bronze for blast furnaces.

The arrangement may also be such that it is possible to cast simultaneously or insuccession in two hollow moulds which are mounted to be tiltable about a common shaft on a suitable frame, so as to permit of casting both in a horizontal and also in averticalposition. The shaft about which tilting occurs serves at the same time as driving shaft and preferably a friction gearing is provided in order to permit of varying the speed within certain limits. The

series of cores are disposed (Oryza-65) transmission to the twol axles carrying the moulds is effected by means of a friction gearing with conical friction wheels which is so dismay be individually disposed that each mould engaged from the driving wh of a conical friction mould may be prepared while casting is taking place in the other.

are provided to bring from the driving shaft to rest in possible time.

In order to effect acceleration in comparatively short time, of the material, a 'conemay be provided-at the bottom drawings, in which:

Fig. 1 shows in long with core, core suppor of the mould which cone urges the material along with it in its rotation and throws it outwardly. If desired the surface of the cone may be provided with turbine or scoop like .ridges or grooves.

invention are accompanying itudinal section aV mould used for preparing an open low body, f

Figs. 1a and carrying bolts.

t and casting gutter as shaft by displacement eel in order that one Appropriate brake devices the mould disengaged the shortest multiple-Walled hol- 1b are enlarged views of the core Fig. 2 is a corresponding end elevation view, Fig. 3 'shows a specific construction of 'the core support in longitudinal section.

Fig. 4 is a corresponding view of a different construction of core support.

Fig. 5 shows a mould and single-walled hollow body.

ration of a closed core for the prepa- Fig. 6 shows mould and core for the preparation of a closed multiple-walled hollow body.

lig. '7 shows mould and core for the preparation of a closed multiple-walled hollowbody of different form.

Fig. 8 shows mould an ture of a hollow body ha d core forthe manufacving two cavities.

i Fig. 9 shows a second constructional form for the manufacture of said hollow body,`

Fig. 10 shows a section through a tuyre for 100 blast furnaces, such as can apparatus according to the Figs. 11 andbe made with the present application,

particularly suitable for carrying out the present process and in parti Fig. 1l is a plan. view,

cular partly in section,

Fig. 12 shows an elevational view, The mould 2 which is rotatable about the axle an open, multiple-walled 3v is used for preparing hollow body such as is indic numeral-` 1 in Fig. 1.

The

atedby the reference axle 3 may be rdis- 12 show an arrangement which is Y Ay number of bolt shaped core supports 8 arev secured to the plate 4 and the core 9 is formed about them in clay or other suitable material. The core carrying bolts 8 are preferably furnished with abore 10 through which the gases.

occurring when the material yof the core is heated can-escape. In the case of completely' closed `hollow bodies this bore may serve for the removal of material of the core by means of compressed air `or water after the hollow body has been completed, whereupon the cast-in core carl core carriers are closed by the plugs.

riers are closed by plugging.

The core carrier B-may of course be constructed without a bore. Preferably-and as shown at 8, it is constructedas a cone or pyramid, but it may be cylindrical as shown at 8', with a flange 11 at its end. y

The plate 4 carrying the core carriers 8 or 8 is provided with a large number of apertures 12 as shown more particularly in Fig'. 2in order to permit of disposing the different core carriers in any desired relative positions as required. The apertures may be temporarily closed by screwed plugs to prevent the liquid metal from flowing out of the mould through them. The holes 13 at the periphery serve to receive -the bolts 5 by means of which the plate is secured to the mould.

If during simultaneous rotation of the mould 2 about the shaft 3, liquid metal is cast iny through the casting gutter 7 then in the rst place the outer wall of the hollow body is prepared and then the inner wall. The various methods of casting in the metal will be discussed These core carriers consist for example of a.

hollow cylinder 14, such as a sheet steel cylinder, which at its innermost end is provided with an outwardly extending flange 15. The core 16 of clay or the like is formed on the outside of the cylinder. cured by the bolts 17.

In the embodiment according to Fig. 4 the core material 16 is on the inner wall of .the cylindrical core carrier 14. In this embodiment \this core carrier is integral with the core carrier plate 4.

In some circumstances it is of course possible to use a complete metal core without clay.

In Figs. 5-9 are shown various moulds with through the apertures in the core carriers 8 whereupon the apertures in these cases in the In the embodiment shown in Fig. '6 a closed multiple- Awalled hollow body' is prepared in that a solid Leeneeo The core carrier plate is sel. core 25 is centrally arranged and an annular core 26 is disposed about it. These cores also are connected to the core carrier plate 4 by means of core carriers 8.

In jthe construction according to Fig. 7a similar arrangement is provided 'but the annular core 26 f Fig. 6 is replaced by a cup-shaped core 27. In the embodiment according to Fig. 8 two solid cores 28 and 29 are arranged one above the otherand they are both carried by core carriers 8 which are secured to the core carrier plate 4. In this arrangement the core carriers for the lower core 29 must pass through the upper core.

The constructional form shownin Fig. 9 permits of the preparation of the same hollow body as that according to Fig. 8 but the lower core is carried by the core carriers 8 from below, these carriers being secured to the mould.

The apparatus shown in Figs. 11 and 12 comprises a support 32 on which is disposed a frame 34 adapted to pivot about 33 the two discs 35 being rotatably journalled on shafts 36 on the member 34. The moulds 37 are secured in known manner on thesev discs 35. Each shaft 36 carries a conicallyvshaped friction wheel 38 and this friction wheel is connected with the driving wheel 40 by way of the conical friction wheel 39. The shaft 41 of this driving wheel is provided with a friction disc 42 which contacts with the friction wheel 43 carried on the shaft 44 and displaceable thereon by means of a screw 45 and a hand wheel 46. The shaft 44 is driven from any suitable motor by means of pulley 47 but this belt transmission can be replaced by a bevel gear or any other transmission. If desired a change speed gear or an intermediate gearing may be interposed between the motor and the shaft 44. v

'Ihe conical friction wheels 39 are adapted to be axially displaced by means of hand wheels 48 and in this wayvany wear of: the friction Wheels 38, 40 can be compensated and also the requisite pressure between the diiferent friction pletely withdrawing one or other friction wheel 39 the corresponding disc 35 with the associated mould 37l can be disconnected `from the motion, the brake levers 49 acting on the friction wheels 38 being used in order to bring the mouldv in question to rest as rapidly as possible.

The pivotation of the entire frame 34 together with the moulds 37 and the corresponding gearing is effected about the pins 33 mounted on the frame 34 and adapted to turn inthe bearings 50. A clamping device 51 may be provided on one or both' bearings in order to -beable to secure the entire frame in any desired position, more particularly in horizontal and vertical position.

wheels can be obtained. Furthermore by com- 120 The pivotation may be effected either manually lby means of a suitable lever or by gear Wheel or pivotation gear or a separate motor may be used for the pivotation. `In certain cir-M0 cumstances the pivotation may be derived from a separate gear directly connected with the main drive. 1

When the shaft 44 and with it the friction wheel 43 are set in rotation by means of the pulley 47, the friction disc l42 together with the shaft 41 and the conical friction wheel 40 are rotated and with greater or less' speed according to the position of the friction wheel 43 with respect to the discI 42. The rotary motion is transmitted by way of the friction Wheels 39 to the two friction Wheels 38 and thus to the shafts 36 and the discs 35 carrying the moulds 37.

Preferably one of the friction wheels 39 is displaced outwardly so that only one mould is driven and casting is effected in this mould by the centrifugal process. The idle mould is in the meantime prepared anew. Then this mould is thrown into gear and the other disconnected, the further rotation of the latter being stopped by the corresponding brake 49. Naturally it is possible to use both moulds for casting simultaneously if desired.

According to the setting of the frame 34 casting may be effected in horizontal, vertical or in oblique position.

Preferably a cooling device for the moulds is also incorporated in the form of tubes 52 passing through the pivot pins 33 to convey a cooling liquid or other cooling Vmedium to the moulds. In this way a very rapid succession of casting operations is made possible. I

The friction gearing be replaced by any other toothed gearing or the like.

suitable gear such as Hollow bodies of described may if desired every kind for example blast furnace fittings, blast and slag tuyres, cooling boxes, cooling rings as Well as axle bearings or brasses, cylinders, containers of all kinds can be cast by the process described above and with the apparatus described for carrying out the process.

We claim:

1. In a centrifugal casting apparatus in combination, a rotatable mould open at one end, means for mounting a core carrying plate on the open end of said mould, said plate having a large central opening and a plurality of smaller openings therein, means projecting from the cores for mounting the latter on said plate, said cores adapted to form a plurality of cavities in said casting.

2. In a centrifugal casting apparatus as dened by claim 1 in which the said means for mounting said core on said carrier plate are provided with openings f or removing the core from the "finished casting.

WILLIBALD RAYM. KARL MERTENS. ALBERT SLZER.

usov 

